RBD volume not made available to Xen virtual guest on openSUSE 15.2 (with libvirt 6.0.0)

[Ján Tomko]

On a Friday in 2020, Marcel Juffermans wrote:
>Hi there,
>
>Since upgrading to openSUSE 15.2 (which includes libvirt 6.0.0) the 
>virtual guests don't get their RBD disks made available to them. On 
>openSUSE 15.1 (which includes libvirt 5.1.0) that worked fine. The XML 
>is as follows:
>

[...]

>I tried to strace libvirtd. The results are as follows:
>
>On openSUSE 15.2 with libvirt 6.0.0 (not working), we see this:
>
>1682  openat(AT_FDCWD, "rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", 
>O_RDWR|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>1682  rt_sigprocmask(SIG_BLOCK, NULL, [BUS USR1 ALRM IO], 8) = 0
>1682  mmap(NULL, 1052672, PROT_READ|PROT_WRITE, 
>MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f538aefd000
>1682  mprotect(0x7f538aefd000, 4096, PROT_NONE <unfinished ...>
>1682  <... mprotect resumed>)           = 0
>1682  rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], [BUS USR1 ALRM 
>IO], 8) = 0
>1682  rt_sigprocmask(SIG_BLOCK, NULL, [BUS USR1 ALRM IO], 8) = 0
>1682  mmap(NULL, 1052672, PROT_READ|PROT_WRITE, 
>MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
>1682  <... mmap resumed>)               = 0x7f538adfc000
>1682  mprotect(0x7f538adfc000, 4096, PROT_NONE <unfinished ...>
>1682  <... mprotect resumed>)           = 0
>1682  rt_sigprocmask(SIG_SETMASK, [BUS USR1 ALRM IO], <unfinished ...>
>1682  <... rt_sigprocmask resumed>[BUS USR1 ALRM IO], 8) = 0
>1682  write(2, "qemu-system-i386: failed to crea"..., 232 <unfinished ...>
>...
>
>On the other hand, on openSUSE 15.1 with libvirt 5.1.0 (working), we 
>see this:
>
>16267 openat(AT_FDCWD, "rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", 
>O_RDONLY|O_NONBLOCK|O_CLOEXEC) = -1 ENOENT (No such file or directory)
>16267 stat("rbd:guests/mytwotel-a:id=libvirt:key=AQCAUpBbrcaiFxAA1sztXPbkdW1L54i99oUpyA==:auth_supported=cephx\\;none", 
>0x7fff83e2e2b0) = -1 ENOENT (No such file or directory)
>16267 access("/usr/lib64/qemu/block-rbd.so", F_OK) = 0
>16267 stat("/usr/lib64/qemu/block-rbd.so", {st_mode=S_IFREG|0644, 
>st_size=27448, ...}) = 0
>16267 openat(AT_FDCWD, "/usr/lib64/qemu/block-rbd.so", 
>O_RDONLY|O_CLOEXEC) = 60
>16267 read(60, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 
>&\0\0\0\0\0\0"..., 832) = 832
>16267 fstat(60, {st_mode=S_IFREG|0644, st_size=27448, ...}) = 0
>16267 mmap(NULL, 2122672, PROT_READ|PROT_EXEC, 
>MAP_PRIVATE|MAP_DENYWRITE, 60, 0) = 0x7f8e6030f000
>16267 mprotect(0x7f8e60315000, 2093056, PROT_NONE) = 0
>16267 mmap(0x7f8e60514000, 8192, PROT_READ|PROT_WRITE, 
>MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 60, 0x5000) = 0x7f8e60514000
>16267 close(60)                         = 0
>...
>
>Note that the latter opens "/usr/lib64/qemu/block-rbd.so". That 
>library *does* exist on openSUSE 15.2 but it doesn't seem to be used.
>

The error message comes from QEMU, what QEMU version are you using?

Jano

>I've tried to update libvirt to a newer version using the Open Build 
>Service repos, but then ran into so many conflicting versions that I 
>gave up.
>
>At this point I'm stuck. Does anyone have an idea I can try?
>
>Many thanks,
>
>Marcel
>
>
>
>
>
>
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